CN113451712B - Tab structure, battery, tab welding method and device - Google Patents
Tab structure, battery, tab welding method and device Download PDFInfo
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- CN113451712B CN113451712B CN202110862476.6A CN202110862476A CN113451712B CN 113451712 B CN113451712 B CN 113451712B CN 202110862476 A CN202110862476 A CN 202110862476A CN 113451712 B CN113451712 B CN 113451712B
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- 238000003466 welding Methods 0.000 title claims abstract description 196
- 238000000034 method Methods 0.000 title claims abstract description 28
- 239000011888 foil Substances 0.000 claims abstract description 108
- 239000000463 material Substances 0.000 claims abstract description 12
- 230000001681 protective effect Effects 0.000 claims description 65
- 239000012790 adhesive layer Substances 0.000 claims description 19
- 238000003825 pressing Methods 0.000 claims description 18
- 229910000679 solder Inorganic materials 0.000 claims description 17
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 16
- 230000001678 irradiating effect Effects 0.000 claims description 8
- 229910052759 nickel Inorganic materials 0.000 claims description 8
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 7
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 7
- 229910052782 aluminium Inorganic materials 0.000 claims description 7
- 229910052802 copper Inorganic materials 0.000 claims description 7
- 239000010949 copper Substances 0.000 claims description 7
- 229910001220 stainless steel Inorganic materials 0.000 claims description 6
- 239000010935 stainless steel Substances 0.000 claims description 6
- 229910000570 Cupronickel Inorganic materials 0.000 claims description 4
- YOCUPQPZWBBYIX-UHFFFAOYSA-N copper nickel Chemical compound [Ni].[Cu] YOCUPQPZWBBYIX-UHFFFAOYSA-N 0.000 claims description 4
- 238000007747 plating Methods 0.000 claims description 4
- 239000003292 glue Substances 0.000 description 22
- 239000010410 layer Substances 0.000 description 10
- 238000010586 diagram Methods 0.000 description 9
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 7
- 229910001416 lithium ion Inorganic materials 0.000 description 7
- 241001391944 Commicarpus scandens Species 0.000 description 5
- 230000004927 fusion Effects 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 238000004590 computer program Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000002844 melting Methods 0.000 description 3
- 230000008018 melting Effects 0.000 description 3
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000007639 printing Methods 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 239000002390 adhesive tape Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000003760 hair shine Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/531—Electrode connections inside a battery casing
- H01M50/536—Electrode connections inside a battery casing characterised by the method of fixing the leads to the electrodes, e.g. by welding
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/20—Bonding
- B23K26/21—Bonding by welding
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/70—Auxiliary operations or equipment
- B23K26/702—Auxiliary equipment
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/531—Electrode connections inside a battery casing
- H01M50/533—Electrode connections inside a battery casing characterised by the shape of the leads or tabs
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K2101/00—Articles made by soldering, welding or cutting
- B23K2101/36—Electric or electronic devices
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Plasma & Fusion (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Connection Of Batteries Or Terminals (AREA)
Abstract
The application provides a tab structure, a battery, a tab welding method and a device thereof, wherein the tab structure comprises tabs, foil materials and protection sheets which are sequentially stacked. The electrode lug, the foil and the protection sheet are provided with welding areas, each welding area comprises a welding hole, and the electrode lug, the foil and the protection sheet are connected through the welding holes. In this application embodiment, utmost point ear structure is including utmost point ear, foil and the protection piece of range upon range of setting in proper order. The electrode lug, the foil and the protection sheet are provided with welding areas, each welding area comprises a welding hole, and the electrode lug, the foil and the protection sheet are connected through the welding holes. The tab, the foil and the protection sheet are welded together through the welding holes, and compared with the mode that the tab, the foil and the protection sheet are fused together through high-frequency vibration in the prior art, the foil fracture possibility is small, so that the risk of easy fracture of the foil in the welding process is reduced by adopting the method provided by the embodiment of the application.
Description
Technical Field
The application relates to the field of lithium ion batteries, in particular to a tab structure, a battery, a tab welding method and a device thereof.
Background
With rapid development of lithium ion battery technology, lithium ion batteries are increasingly used in portable mobile electronic devices such as notebook computers and smart phones. At present, in the technology of welding the tabs of the lithium ion battery, a plurality of layers of foil materials are welded together in a general ultrasonic welding mode, the ultrasonic welding is transmitted to the surfaces of objects to be welded by high-frequency vibration waves, and under the condition of pressurization, the surfaces of the objects are rubbed with each other to form fusion between molecular layers. In this way, when the number of layers of the foil is too large, the frequency of the high-frequency vibration wave needs to be increased to realize fusion between the foils, but the foil is easy to break when vibrating at a higher frequency, and the risk of cold joint overspray exists.
Disclosure of Invention
The embodiment of the application provides a tab structure, a battery, a tab welding method and a device thereof, which solve the problem that foil is easy to break in the welding process.
In order to achieve the above objective, in a first aspect, an embodiment of the present application provides a tab structure, including a tab, a foil, and a protection sheet that are sequentially stacked;
the electrode lug, the foil and the protection sheet are provided with welding areas, the welding areas comprise welding holes, and the electrode lug, the foil and the protection sheet are connected through the welding holes.
Optionally, the tab and the protection sheet are both provided with a first adhesive layer, the length range of the first adhesive layer is 10mm to 200mm, the width range of the first adhesive layer is 3mm to 10mm, the length range of the first adhesive layer exceeding the tab and the protection sheet is 0.5mm to 10mm, and the width range of the first adhesive layer exceeding the tab and the protection sheet is 0.5mm to 50mm.
Optionally, the welding holes are cones, the welding area further comprises at least two welding marks distributed on the protection sheet, the maximum width of the welding marks ranges from 10 μm to 2000 μm, and the at least two welding marks are distributed on the protection sheet in an array.
Optionally, the welding edge is provided with a protrusion, and the depth of the welding hole is greater than or equal to twice the height of the protrusion.
Optionally, the thickness of the protective sheet ranges from 0.1mm to 1mm, the length of the protective sheet ranges from 5mm to 65mm, and the width of the protective sheet ranges from 2mm to 10mm.
Optionally, the material of the protective sheet includes at least one of stainless steel, nickel, copper nickel plating, copper and aluminum.
In a second aspect, an embodiment of the present application further provides a tab welding method, including:
sequentially stacking the electrode lugs, the foil and the protective sheets;
placing a pressing member in an area of the protective sheet other than the welding area;
under the condition that the electrode lug, the foil and the protection sheet are pressed by the pressing piece, a welding area is formed by irradiating the welding area with a laser beam, the welding area comprises a welding hole, and the electrode lug, the foil and the protection sheet are welded by the welding hole.
In a third aspect, an embodiment of the present application further provides a tab welding device, including:
the first placement module is used for sequentially stacking the electrode lugs, the foil materials and the protection sheets;
a second placement module for placing the pressing member in an area of the protective sheet other than the welding area;
and the welding module is used for irradiating the welding area by utilizing the laser beam to form a welding area under the condition that the electrode lug, the foil and the protection sheet are pressed by the pressing piece, wherein the welding area comprises a welding hole, and the electrode lug, the foil and the protection sheet are welded by the welding hole.
In a fourth aspect, an embodiment of the present application further provides a battery, the battery includes a battery core and the tab structure of the first aspect, be equipped with the second glue film on the battery core, the second glue film is adjacent with first glue film, the length scope of second glue film is 10mm to 200mm, the width scope of second glue film is 0mm to 100mm, the second glue film surpasses the length scope of battery core is 3mm to 15mm.
Optionally, the tab in the tab structure includes a hard tab and a soft tab, and an included angle between the hard tab and the soft tab ranges from 45 degrees to 135 degrees.
In this application embodiment, utmost point ear structure is including utmost point ear, foil and the protection piece of range upon range of setting in proper order. The electrode lug, the foil and the protection sheet are provided with welding areas, each welding area comprises a welding hole, and the electrode lug, the foil and the protection sheet are connected through the welding holes. The tab, the foil and the protection sheet are welded together through the welding holes, and compared with the mode that the tab, the foil and the protection sheet are fused together through high-frequency vibration in the prior art, the foil fracture possibility is small, so that the risk of easy fracture of the foil in the welding process is reduced by adopting the method provided by the embodiment of the application.
Drawings
For a clearer description of the technical solutions in the embodiments of the present application, the following description will be given with reference to the accompanying drawings, which are only embodiments of the present application, and it is obvious to those skilled in the art that other drawings can be obtained from the listed drawings without inventive effort.
Fig. 1 is a flowchart of a tab welding method provided in an embodiment of the present application;
fig. 2 is a schematic structural diagram of a tab structure according to an embodiment of the present disclosure;
FIG. 3 is a second schematic structural view of a tab structure according to an embodiment of the present disclosure;
FIG. 4 is a third schematic structural view of a tab structure according to an embodiment of the present disclosure;
FIG. 5 is a schematic diagram of a tab structure according to an embodiment of the present disclosure;
FIG. 6 is a fifth schematic structural diagram of a tab structure according to an embodiment of the present disclosure;
FIG. 7 is a schematic diagram of a tab structure according to an embodiment of the present disclosure;
FIG. 8 is a schematic diagram of a tab structure according to an embodiment of the present disclosure;
fig. 9 is a schematic structural diagram of a tab structure according to an embodiment of the present disclosure;
FIG. 10 is a diagram illustrating a tab structure according to an embodiment of the present disclosure;
FIG. 11 is a schematic view of a tab structure according to an embodiment of the present disclosure;
FIG. 12 is a schematic diagram of a tab structure according to an embodiment of the present disclosure;
fig. 13 is a schematic structural view of a tab welding device according to an embodiment of the present disclosure;
fig. 14 is a schematic structural diagram of an electronic device according to an embodiment of the present application.
Detailed Description
The following description of the technical solutions in the embodiments of the present application will be made clearly and completely with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the inventors, are within the scope of the present application, based on the embodiments herein.
In the prior art, in the welding technology of the lithium ion battery tab, a plurality of layers of foil materials are welded together in an ultrasonic welding mode, the ultrasonic welding is transmitted to the surface of an object to be welded by utilizing high-frequency vibration waves, and under the condition of pressurization, the surfaces of the object are rubbed with each other to form fusion between molecular layers. In this way, when the number of layers of the foil is too large, the frequency of the high-frequency vibration wave needs to be increased to realize fusion between the foils, but the foil is easy to break when vibrating at a higher frequency, and the risk of cold joint overspray exists. In addition, the horn mount is severely worn due to the heat generated by the ultrasonic vibration. And if the multilayer foil is pre-welded in an ultrasonic welding mode, and then the multilayer foil is welded with the electrode lugs in a laser welding mode, the problem that the effective welding area is smaller during laser welding and the overcurrent capacity of the lithium ion battery is poor can occur due to poor welding and printing flatness in the ultrasonic pre-welding process.
In order to solve at least one of the above problems, referring to fig. 4 and 8, an embodiment of the present application provides a tab structure, including a tab 4, a foil 3, and a protection sheet 2 that are sequentially stacked;
the electrode lug 4, the foil 3 and the protection sheet 2 are provided with welding areas, the welding areas comprise welding holes, and the electrode lug 4, the foil 3 and the protection sheet 2 are connected through the welding holes.
It should be appreciated that the solder holes may be formed by melting the tab 4, the foil 9, and the protective sheet 2 by laser beam irradiation, or other heat source. The thickness of the tab 4 ranges from 0.04mm to 1mm, the width of the tab 4 ranges from 5mm to 80mm, the material of the foil 3 is usually aluminum or copper, and the thickness of the foil 3 ranges from 0.004mm to 0.03mm. The number of layers of the foil 3 may be one or more, for example, the number of layers of the foil 3 may be in a range of 15 to 200. The material of the protective sheet 2 comprises at least one of stainless steel, nickel, copper nickel plating, copper and aluminum. That is, the material of the protective sheet 2 may be any one of stainless steel, nickel, copper-plated nickel, copper and aluminum, or may be a mixed material of any one of stainless steel, nickel, copper-plated nickel, copper and aluminum. The width of the lands is typically 0.5mm to 5mm and the length of the lands is typically 5mm to 80mm. The protective sheet is required to cover the entire welding area, alternatively, the length of the protective sheet is in the range of 5mm to 65mm, and the width of the protective sheet is in the range of 2mm to 10mm
In this application embodiment, utmost point ear structure is including utmost point ear, foil and the protection piece of range upon range of setting in proper order. The electrode lug, the foil and the protection sheet are provided with welding areas, each welding area comprises a welding hole, and the electrode lug, the foil and the protection sheet are connected through the welding holes. The tab, the foil and the protection sheet are welded together through the welding holes, and compared with the mode that the tab, the foil and the protection sheet are fused together through high-frequency vibration in the prior art, the foil fracture possibility is small, so that the risk of easy fracture of the foil in the welding process is reduced by adopting the method provided by the embodiment of the application.
Optionally, referring to fig. 6 and 11, the surface of the above-mentioned bonding area may also be provided with a protective paste 5. The protection glue 5 is including setting up the first glue film on utmost point ear and protection piece and setting up the second glue film on battery cell, utmost point ear with all be equipped with first glue film on the protection piece, the length scope of first glue film is 10mm to 200mm, the width scope of first glue film is 3mm to 10mm. The first adhesive layer can be adhesive tape, the first adhesive layer exceeds the length range of the tab and the protection sheet is 0.5mm to 10mm, and the first adhesive layer exceeds the width range of the tab and the protection sheet is 0.5mm to 50mm.
Optionally, the welding hole is a cone. In the case of the hole being a cone, burrs generated by the hole are less. Too much burrs can affect battery performance. For example, a welding region may be irradiated with the laser beam 1 to form a welding region including a welding hole through which the tab 4, the foil 3, and the protective sheet 2 are welded. The lands may also include solder marks, and the solder holes may extend through the tab 4, the foil 3, and the protective sheet 2, thereby leaving solder marks on both the protective sheet 2 and the tab 4.
Optionally, the bonding region further comprises at least two bonding marks distributed on the protective sheet 2, wherein the maximum width of the bonding marks ranges from 10 μm to 2000 μm.
Specifically, when the welding region is irradiated with the laser beam 1 or the welding region is heated with the heat source to form a welding hole, a welding mark is formed on the protective sheet 2 and/or the tab 4. For example, the welding region may be irradiated with the plurality of laser beams 1 simultaneously to form a plurality of welding marks on the protection sheet 2 and/or the tab 4 simultaneously, or the welding region may be irradiated with the laser beams 1 a plurality of times to form a plurality of welding marks on the protection sheet 2 and/or the tab 4 in a plurality of times. Theoretically, the more solder marks and holes are formed, the more reliable the connection between the protection sheet 2, the foil 3 and the tab 4. The number of welding marks can be reasonably set according to the size of the welding area, so that the connection among the protection sheet 2, the foil 3 and the tab 4 is more reliable.
The shape of the solder marks may be any shape, for example the solder marks may be circular, in which case the solder marks have a diameter in the range of 10 μm to 2000 μm.
The solder marks may be arranged regularly on the protective sheet 2 and/or the tab 4, or may be arranged irregularly. Optionally, when there are at least two solder marks on the protective sheet 2, the at least two solder marks are distributed in an array on the protective sheet 2.
Optionally, the welding edge is provided with a protrusion, and the depth of the welding hole is greater than or equal to twice the height of the protrusion. Illustratively, the depth of the solder holes is greater than 300 μm, the solder edges have a small amount of flash, the bumps are formed, and the height of the bumps is less than 150 μm. The depth of the welding hole is greater than or equal to twice the height of the protrusion.
The embodiment of the application also provides a tab welding mode, which is to heat the tab, the foil and the protection sheet by using a laser beam as a heat source to melt the tab, the foil and the protection sheet to form a welding hole so as to weld the tab, the foil and the protection sheet together in a laser welding mode, and the welding mode is described in detail below.
Referring to fig. 1, 5 and 10, an embodiment of the present application provides a tab welding method, including:
step 101, sequentially stacking the tab 4, the foil 3 and the protection sheet 2;
step 102, placing a pressing piece in an area of the protective sheet 2 except for a welding area;
step 103, under the condition that the tab 4, the foil 3 and the protection sheet 2 are pressed by the pressing piece, irradiating the welding area by using the laser beam 1 to form a welding area, wherein the welding area comprises a welding hole, and the tab 4, the foil 3 and the protection sheet 2 are welded by the welding hole.
It will be appreciated that the number of layers of the foil 3 is not limited in the manner in which the welding region is irradiated with the laser beam 1 to form a weld zone to effect welding. Since the foils 3 are extremely thin, when the multi-layered foils 3 are stacked, a large gap may exist between adjacent foils 3. The protective sheet 2 is arranged on the foil 3 and completely covers the foil 3, and the electrode lugs 4, the foil 3 and the protective sheet 2 can be pressed by the pressing piece on the protective sheet 2, so that no gap exists between the adjacent foils 3 and the adjacent foils are in complete contact with each other.
The thickness of the protective sheet 2 should be such that the protective sheet 2 has a certain strength so that the protective sheet 2 can uniformly transmit the pressing force to the entire surface of the foil 3 when the pressing member acts on other areas of the protective sheet 2 than the welding area. However, the thickness of the protective sheet 2 should not be too thick, and the too thick protective sheet 2 occupies too much space of the battery cell 6, resulting in a decrease in battery energy density. It has been found through experiments that the above two problems can be simultaneously satisfied when the thickness of the protective sheet 2 is in the range of 0.1mm to 1 mm. It will be appreciated that the hold-down member may be removed from the protective sheet 2 after the welding is completed.
The welding region is a region directly irradiated with the laser beam 1. The welding area may be in any shape in theory, and in the case of a rectangular welding area, the welding area has a width in the range of 0.5mm to 5mm and a length in the range of 5mm to 80mm.
In this embodiment, under the condition that the tab 4, the foil 3 and the protection sheet 2 are pressed by the pressing member, the welding region is irradiated with the laser beam 1 to form a welding hole, and the tab 4, the foil 3 and the protection sheet 2 are welded by the welding hole. The laser beam 1 is used as a heat source to heat the tab 4, the foil 3 and the protection sheet 2 to enable the tab 4, the foil 3 and the protection sheet 2 to be melted to form a welding hole so as to be welded together, and compared with the prior art that the foil 3 is easy to break due to high-frequency vibration, the foil 3 is less in the possibility of being heated, melted and broken, so that the risk of the foil 3 being easy to break in the welding process is reduced by adopting the method provided by the embodiment of the application.
In addition, this application embodiment directly adopts laser welding's mode, directly welds protection piece 2, foil 3 and utmost point ear 4 together, need not to use ultrasonic welding's mode to weld multilayer foil 3 in advance earlier, and the mode that utilizes laser welding welds multilayer foil 3 and utmost point ear 4 together again. Therefore, the problem that the effective welding area is smaller when laser welding is caused by poor welding and printing flatness in the ultrasonic pre-welding process, and the overcurrent capacity of the lithium ion battery is poor is avoided.
Furthermore, the embodiment of the application directly adopts the laser welding mode to weld, so that the problems of serious welding seat abrasion, unstable welding process and cold joint overspray caused by ultrasonic welding are avoided.
The method provided in the embodiments of the present application is described below in two examples.
First, referring to fig. 2, a protective sheet 2 is placed, the protective sheet 2 is placed over a foil 3, and the protective sheet 2 needs to cover the entire welding area;
second, referring to fig. 3, the foil 3 is placed, and the cell 6 is placed over the protective sheet 2;
thirdly, referring to fig. 4, the tab 4 is placed, the thickness range of the tab 4 may be 0.04-1mm, the width range thereof may be 5-65mm, and the width of the tab 4 may be greater than, equal to or less than the width of the foil 3;
fourth, referring to fig. 5, in the case that the tab 4, the foil 3 and the protection sheet 2 are compressed by the compressing member, a welding area is formed by irradiating the welding area with the laser beam 1, the welding area includes a welding hole, and the tab 4, the foil 3 and the protection sheet 2 are welded by the welding hole;
fifth, referring to fig. 6, a protective adhesive 5 is applied on the upper and lower surfaces of the solder pad.
Example one can also accomplish the welding to tab 4, foil 3 and protection piece 2, but it will place tab 4 in the top, and laser beam 1 directly shines tab 4, and the heat input is great, has the risk of melting tab 4 glue. And the example one does not bend the welded tab 4, which causes space waste, thereby reducing the energy density of the battery.
Therefore, the present application further provides an example two, in the first step, referring to fig. 7, the tab 4 is placed, the thickness of the tab 4 ranges from 0.04mm to 1mm, the width ranges from 5mm to 65mm, and the width of the tab 4 can be greater than, equal to or less than the width of the foil 3;
secondly, referring to fig. 8, placing a foil 3 and placing a battery cell 6 above the tab 4;
thirdly, referring to fig. 9, a protective sheet 2 is placed, the protective sheet 2 is placed above the foil 3, and the protective sheet 2 needs to cover the whole welding area;
fourth, referring to fig. 10, in the case that the tab 4, the foil 3 and the protective sheet 2 are compressed by the compressing member, a welding area is formed by irradiating the welding area with the laser beam 1, the welding area including a welding hole through which the tab 4, the foil 3 and the protective sheet 2 are welded;
fifth, referring to fig. 11, attaching a protective adhesive 5 on the upper and lower surfaces of the welding area;
sixth, referring to fig. 12, the tab 4 is bent, the welded tab 4 is bent, and the angle between the hard tab of the tab 4 and the soft tab of the tab 4 is about 90 °, and the bent tab 4 is shown in fig. 12.
In the second example, the protection sheet 2 is placed on the uppermost layer, the laser beam 1 directly irradiates the protection sheet 2, the laser beam 1 directly irradiates the lug 4, the heat input is large, and the risk of melting the glue of the lug 4 is avoided. In addition, the welded tab 4 is bent, so that space is saved, and the energy density of the battery can be improved.
Referring to fig. 13, an embodiment of the present application further provides a tab welding device 200, including:
a first placement module 201, configured to sequentially stack the tab, the foil, and the protection sheet;
a second placement module 202 for placing a pressing member in an area of the protective sheet other than the welding area;
and the welding module 203 is configured to irradiate the welding area with a laser beam to form a welding area, where the welding area includes a welding hole, and the tab, the foil, and the protection sheet are welded through the welding hole under the condition that the tab, the foil, and the protection sheet are pressed by the pressing member.
Optionally, the welding hole is a cone.
Optionally, the bonding region further includes at least two bonding marks distributed on the protective sheet, and the bonding marks have a maximum width ranging from 10 μm to 2000 μm.
Optionally, the at least two solder marks are distributed in an array on the protective sheet.
Optionally, the welding edge is provided with a protrusion, and the depth of the welding hole is greater than or equal to twice the height of the protrusion.
Optionally, the thickness of the protective sheet ranges from 0.1mm to 1 mm.
Optionally, the material of the protective sheet includes at least one of stainless steel, nickel, copper nickel plating, copper and aluminum.
The tab welding device 200 provided in the embodiment of the present application can implement each process that can be implemented in the embodiment of the tab welding method provided in the present application, so as to achieve the same beneficial effect, and in order to avoid repetition, no further description is provided herein.
The embodiment of the application still provides a battery, the battery includes electric core and the utmost point ear structure that this application embodiment provided, is equipped with the second glue film on the electric core, the second glue film is adjacent with first glue film, the length scope of second glue film is 10mm to 200mm, the width scope of second glue film is 0mm to 100mm, and the second glue film also can be gummed paper, the second glue film surpasses the length scope of electric core is 3mm to 15mm, on the width direction, the second glue film does not surpass the electric core. The structure and the working principle of the tab structure provided in the embodiment of the present application may refer to the above embodiment, and are not described herein again. The battery provided by the embodiment of the application comprises the tab structure provided by the embodiment of the application, so that the battery has all the beneficial effects of the tab structure provided by the embodiment of the application.
Alternatively, referring to fig. 12, the tab in the tab structure includes a hard tab and a soft tab, and an included angle between the hard tab and the soft tab ranges from 45 degrees to 135 degrees. The tab in the tab structure is bent, so that the length of the tab structure can be reduced, and the internal space of the battery can be saved.
Referring to fig. 14, the embodiment of the present application further provides an electronic device 300, where the electronic device 300 includes: a processor 301, a memory 302 and a computer program stored on and executable on said memory 302, the various components in the electronic device 300 being coupled together by a bus system 303. It is understood that the bus system 303 is used to enable connected communication between these components.
The processor 301 is configured to sequentially stack the tab, the foil, and the protection sheet;
placing a pressing member in an area of the protective sheet other than the welding area;
under the condition that the electrode lug, the foil and the protection sheet are pressed by the pressing piece, a welding area is formed by irradiating the welding area with a laser beam, the welding area comprises a welding hole, and the electrode lug, the foil and the protection sheet are welded by the welding hole.
The electronic device 300 provided in the embodiment of the present application can implement each process that can be implemented in the embodiment of the tab welding method of the present application, and achieve the same beneficial effects, so as to avoid repetition, and will not be described herein again.
The embodiment of the application further provides a readable storage medium, on which a computer program is stored, and when the computer program is executed by a processor, the processes of the above tab welding method embodiment are implemented, and the same technical effects can be achieved, so that repetition is avoided, and no further description is provided herein. Wherein the computer readable storage medium is selected from Read-Only Memory (ROM), random access Memory (Random Access Memory, RAM), magnetic disk or optical disk.
The embodiments of the present application have been described above with reference to the accompanying drawings, but the present application is not limited to the above-described embodiments, which are merely illustrative and not restrictive, and many forms may be made by those of ordinary skill in the art without departing from the spirit of the present application and the scope of the claims, which are also within the protection of the present application.
Claims (9)
1. The tab structure is characterized by comprising a tab, a foil and a protection sheet which are sequentially laminated;
the electrode lugs, the foil and the protection sheet are internally provided with welding areas, the welding areas comprise welding holes, the electrode lugs, the foil and the protection sheet are connected after being welded for one time through the welding holes, and the welding holes are conical;
the welding area further comprises at least two welding marks distributed on the protective sheet, the edges of the welding marks are provided with bulges, and the depth of the welding holes is more than or equal to twice the height of the bulges;
the coverage area of the protective sheet is larger than that of the welding area.
2. The tab structure of claim 1, wherein the tab and the protective sheet are provided with a first adhesive layer, the length of the first adhesive layer ranges from 10mm to 200mm, the width of the first adhesive layer ranges from 3mm to 10mm, the length of the first adhesive layer exceeding the tab and the protective sheet ranges from 0.5mm to 10mm, and the width of the first adhesive layer exceeding the tab and the protective sheet ranges from 0.5mm to 50mm.
3. The tab structure of claim 1, wherein the maximum width of the solder marks is in the range of 10 μm to 2000 μm, and the at least two solder marks are distributed in an array on the protective sheet.
4. The tab structure of claim 1, wherein the thickness of the protective sheet ranges from 0.1mm to 1mm, the length of the protective sheet ranges from 5mm to 65mm, and the width of the protective sheet ranges from 2mm to 10mm.
5. The tab structure of claim 1, wherein the material of the protective sheet comprises at least one of stainless steel, nickel, copper nickel plating, copper and aluminum.
6. The tab welding method is characterized by comprising the following steps of:
sequentially stacking the electrode lugs, the foil and the protective sheets;
placing a pressing member in an area of the protective sheet other than the welding area;
under the condition that the electrode lugs, the foil and the protection sheet are pressed by the pressing piece, a welding area is formed by irradiating the welding area with a laser beam, the welding area comprises welding holes, the electrode lugs, the foil and the protection sheet are connected after being welded for one time by the welding holes, the welding holes are cones, the welding area further comprises at least two welding marks distributed on the protection sheet, the edges of the welding marks are provided with bulges, and the depth of the welding holes is more than or equal to twice the height of the bulges; the coverage area of the protective sheet is larger than that of the welding area.
7. The utility model provides a utmost point ear welding set which characterized in that includes:
the first placement module is used for sequentially stacking the electrode lugs, the foil materials and the protection sheets;
a second placement module for placing the pressing member in an area of the protective sheet other than the welding area;
the welding module is used for irradiating the welding area to form a welding area by utilizing the laser beam under the condition that the electrode lug, the foil and the protection sheet are tightly pressed by the pressing piece, the welding area comprises a welding hole, the electrode lug, the foil and the protection sheet are connected after being welded for one time by the welding hole, the welding hole is a cone, the welding area further comprises at least two welding marks distributed on the protection sheet, the edges of the welding marks are provided with protrusions, the depth of the welding hole is larger than or equal to twice the height of the protrusions, and the coverage area of the protection sheet is larger than that of the welding area.
8. A battery, characterized in that the battery comprises a battery core and a tab structure as claimed in any one of claims 1 to 5, wherein a second adhesive layer is arranged on the battery core, the second adhesive layer is adjacent to the first adhesive layer, the length range of the second adhesive layer is 10mm to 200mm, the width range of the second adhesive layer is 0mm to 100mm, and the length range of the second adhesive layer exceeding the battery core is 3mm to 15mm.
9. The battery of claim 8, wherein the tabs in the tab structure comprise hard tabs and soft tabs, and an included angle between the hard tabs and the soft tabs ranges from 45 degrees to 135 degrees.
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| CN202110862476.6A CN113451712B (en) | 2021-07-29 | 2021-07-29 | Tab structure, battery, tab welding method and device |
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| CN202110862476.6A CN113451712B (en) | 2021-07-29 | 2021-07-29 | Tab structure, battery, tab welding method and device |
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| CN114094044A (en) * | 2021-11-18 | 2022-02-25 | 珠海冠宇电池股份有限公司 | Pole piece and battery |
| CN114700604A (en) * | 2022-03-18 | 2022-07-05 | 江阴纳力新材料科技有限公司 | Ultrasonic welding method for tabs |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104681877A (en) * | 2013-11-28 | 2015-06-03 | 比亚迪股份有限公司 | Power battery electrode core, power battery and preparation method for power battery electrode core |
| CN108465933A (en) * | 2018-02-13 | 2018-08-31 | 深圳吉阳智能科技有限公司 | A kind of method and apparatus of laser welding foil and lug |
| CN208862096U (en) * | 2018-08-21 | 2019-05-14 | 东莞塔菲尔新能源科技有限公司 | A kind of assembling structure of power battery top cover and battery core |
| KR20190082549A (en) * | 2018-01-02 | 2019-07-10 | 삼성에스디아이 주식회사 | Battery pack and manufacturing method for thereof |
| WO2019150714A1 (en) * | 2018-01-30 | 2019-08-08 | 株式会社日立製作所 | Layered cell |
| CN111129414A (en) * | 2019-12-31 | 2020-05-08 | 江苏丰盈科技有限公司 | Lithium ion battery core package, lithium ion battery and preparation method of lithium ion battery |
| CN111375882A (en) * | 2018-12-28 | 2020-07-07 | 中天储能科技有限公司 | Tab welding method and battery prepared by using same |
| CN111799429A (en) * | 2020-07-22 | 2020-10-20 | 昆山聚创新能源科技有限公司 | Pouch battery and method for assembling pouch battery |
| CN112599935A (en) * | 2020-12-14 | 2021-04-02 | 天津市捷威动力工业有限公司 | Lithium ion power soft package battery tab and manufacturing method of battery |
| CN215418507U (en) * | 2021-07-29 | 2022-01-04 | 珠海冠宇电池股份有限公司 | Tab structure and battery |
-
2021
- 2021-07-29 CN CN202110862476.6A patent/CN113451712B/en active Active
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104681877A (en) * | 2013-11-28 | 2015-06-03 | 比亚迪股份有限公司 | Power battery electrode core, power battery and preparation method for power battery electrode core |
| KR20190082549A (en) * | 2018-01-02 | 2019-07-10 | 삼성에스디아이 주식회사 | Battery pack and manufacturing method for thereof |
| WO2019150714A1 (en) * | 2018-01-30 | 2019-08-08 | 株式会社日立製作所 | Layered cell |
| CN108465933A (en) * | 2018-02-13 | 2018-08-31 | 深圳吉阳智能科技有限公司 | A kind of method and apparatus of laser welding foil and lug |
| CN208862096U (en) * | 2018-08-21 | 2019-05-14 | 东莞塔菲尔新能源科技有限公司 | A kind of assembling structure of power battery top cover and battery core |
| CN111375882A (en) * | 2018-12-28 | 2020-07-07 | 中天储能科技有限公司 | Tab welding method and battery prepared by using same |
| CN111129414A (en) * | 2019-12-31 | 2020-05-08 | 江苏丰盈科技有限公司 | Lithium ion battery core package, lithium ion battery and preparation method of lithium ion battery |
| CN111799429A (en) * | 2020-07-22 | 2020-10-20 | 昆山聚创新能源科技有限公司 | Pouch battery and method for assembling pouch battery |
| CN112599935A (en) * | 2020-12-14 | 2021-04-02 | 天津市捷威动力工业有限公司 | Lithium ion power soft package battery tab and manufacturing method of battery |
| CN215418507U (en) * | 2021-07-29 | 2022-01-04 | 珠海冠宇电池股份有限公司 | Tab structure and battery |
Non-Patent Citations (3)
| Title |
|---|
| 巩水利.《先进激光加工技术[M]》.北京：航空工业出版社,2016,第195-206页. * |
| 张忠诚、张双杰、李志永主编.《工程材料及成形工艺基础[M]》.北京：航空工业出版社,2019,第239页. * |
| 超声波焊接技术在锂离子电池行业中的应用;王玉涛;庞松;樊彦良;刘吉云;;电池;20121225(06);全文 * |
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